[SPR-6184] AnnotationConfigContextLoader now extends AbstractGenericContextLoader; added new extension points to AbstractGenericContextLoader.

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@4141 50f2f4bb-b051-0410-bef5-90022cba6387

org.springframework.test/src/main/java/org/springframework/test/context/support/AbstractGenericContextLoader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,6 @@ package org.springframework.test.context.support;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-
 import org.springframework.beans.factory.support.BeanDefinitionReader;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.context.ConfigurableApplicationContext;
@@ -48,37 +47,35 @@ public abstract class AbstractGenericContextLoader extends AbstractContextLoader
 	 * Loads a Spring ApplicationContext from the supplied <code>locations</code>.
 	 * <p>Implementation details:
 	 * <ul>
-	 * <li>Creates a standard {@link GenericApplicationContext} instance.</li>
-	 * <li>Populates it from the specified config locations through a
-	 * {@link #createBeanDefinitionReader(GenericApplicationContext) BeanDefinitionReader}.</li>
+	 * <li>Delegates to {@link #createGenericApplicationContext()} to
+	 * create a {@link GenericApplicationContext} instance.</li>
+	 * <li>Calls {@link #prepareContext(GenericApplicationContext)} to
+	 * prepare the context.</li>
 	 * <li>Calls {@link #customizeBeanFactory(DefaultListableBeanFactory)} to
-	 * allow for customizing the context's DefaultListableBeanFactory.</li>
+	 * allow for customizing the context's <code>DefaultListableBeanFactory</code>.</li>
+	 * <li>Delegates to {@link #loadBeanDefinitions(GenericApplicationContext, String...)}
+	 * to populate the context from the specified config locations.</li>
 	 * <li>Delegates to {@link AnnotationConfigUtils} for
-	 * {@link AnnotationConfigUtils#registerAnnotationConfigProcessors(org.springframework.beans.factory.support.BeanDefinitionRegistry) registering}
+	 * {@link AnnotationConfigUtils#registerAnnotationConfigProcessors registering}
 	 * annotation configuration processors.</li>
 	 * <li>Calls {@link #customizeContext(GenericApplicationContext)} to allow
 	 * for customizing the context before it is refreshed.</li>
 	 * <li>{@link ConfigurableApplicationContext#refresh() Refreshes} the
 	 * context and registers a JVM shutdown hook for it.</li>
 	 * </ul>
-	 * <p>Subclasses must provide an appropriate implementation of
-	 * {@link #createBeanDefinitionReader(GenericApplicationContext)}.
 	 * @return a new application context
 	 * @see org.springframework.test.context.ContextLoader#loadContext
 	 * @see GenericApplicationContext
-	 * @see #customizeBeanFactory(DefaultListableBeanFactory)
-	 * @see #createBeanDefinitionReader(GenericApplicationContext)
-	 * @see BeanDefinitionReader
 	 */
 	public final ConfigurableApplicationContext loadContext(String... locations) throws Exception {
 		if (logger.isDebugEnabled()) {
-			logger.debug("Loading ApplicationContext for locations [" +
-					StringUtils.arrayToCommaDelimitedString(locations) + "].");
+			logger.debug(String.format("Loading ApplicationContext for locations [%s].",
+				StringUtils.arrayToCommaDelimitedString(locations)));
 		}
-		GenericApplicationContext context = new GenericApplicationContext();
+		GenericApplicationContext context = createGenericApplicationContext();
 		prepareContext(context);
 		customizeBeanFactory(context.getDefaultListableBeanFactory());
-		createBeanDefinitionReader(context).loadBeanDefinitions(locations);
+		loadBeanDefinitions(context, locations);
 		AnnotationConfigUtils.registerAnnotationConfigProcessors(context);
 		customizeContext(context);
 		context.refresh();
@@ -87,7 +84,21 @@ public abstract class AbstractGenericContextLoader extends AbstractContextLoader
 	}
 
 	/**
-	 * Prepare the {@link GenericApplicationContext} created by this ContextLoader.
+	 * Factory method for creating a new {@link GenericApplicationContext} 
+	 * to be used by this <code>ContextLoader</code>.
+	 * <p>The default implementation returns an instance of
+	 * {@link GenericApplicationContext}. Can be overridden in subclasses
+	 * to return a specific subclass of <code>GenericApplicationContext</code>.
+	 * @return a new <code>GenericApplicationContext</code>
+	 * @since 3.1
+	 * @see #loadContext
+	 */
+	protected GenericApplicationContext createGenericApplicationContext() {
+		return new GenericApplicationContext();
+	}
+
+	/**
+	 * Prepare the {@link GenericApplicationContext} created by this <code>ContextLoader</code>.
 	 * Called <i>before</> bean definitions are read.
 	 * <p>The default implementation is empty. Can be overridden in subclasses to
 	 * customize GenericApplicationContext's standard settings.
@@ -100,11 +111,10 @@ public abstract class AbstractGenericContextLoader extends AbstractContextLoader
 	}
 
 	/**
-	 * Customize the internal bean factory of the ApplicationContext created by
-	 * this ContextLoader.
+	 * Customize the internal bean factory of the ApplicationContext created by this <code>ContextLoader</code>.
 	 * <p>The default implementation is empty but can be overridden in subclasses
 	 * to customize DefaultListableBeanFactory's standard settings.
-	 * @param beanFactory the bean factory created by this ContextLoader
+	 * @param beanFactory the bean factory created by this <code>ContextLoader</code>
 	 * @see #loadContext
 	 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory#setAllowBeanDefinitionOverriding(boolean)
 	 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory#setAllowEagerClassLoading(boolean)
@@ -115,24 +125,45 @@ public abstract class AbstractGenericContextLoader extends AbstractContextLoader
 	}
 
 	/**
-	 * Factory method for creating new {@link BeanDefinitionReader}s for
+	 * Load bean definitions into the supplied {@link GenericApplicationContext context}
+	 * from the specified resource locations.
+	 * <p>The default implementation delegates to the {@link BeanDefinitionReader}
+	 * returned by {@link #createBeanDefinitionReader} to 
+	 * {@link BeanDefinitionReader#loadBeanDefinitions(String) load} the
+	 * bean definitions.
+	 * <p>Subclasses must provide an appropriate implementation of
+	 * {@link #createBeanDefinitionReader}.
+	 * Alternatively subclasses may provide a <em>no-op</em> implementation
+	 * of {@link #createBeanDefinitionReader} and override this method to
+	 * provide a custom strategy for loading or registering bean definitions.
+	 * @param context the context into which the bean definitions should be loaded
+	 * @param locations the resource locations from which to load the bean definitions
+	 * @since 3.1
+	 * @see #loadContext
+	 */
+	protected void loadBeanDefinitions(GenericApplicationContext context, String... locations) {
+		createBeanDefinitionReader(context).loadBeanDefinitions(locations);
+	}
+
+	/**
+	 * Factory method for creating a new {@link BeanDefinitionReader} for
 	 * loading bean definitions into the supplied
 	 * {@link GenericApplicationContext context}.
 	 * @param context the context for which the BeanDefinitionReader should be created
 	 * @return a BeanDefinitionReader for the supplied context
-	 * @see #loadContext
+	 * @see #loadBeanDefinitions
 	 * @see BeanDefinitionReader
 	 */
 	protected abstract BeanDefinitionReader createBeanDefinitionReader(GenericApplicationContext context);
 
 	/**
-	 * Customize the {@link GenericApplicationContext} created by this ContextLoader
-	 * <i>after</i> bean definitions have been loaded into the context but
-	 * before the context is refreshed.
+	 * Customize the {@link GenericApplicationContext} created by this
+	 * <code>ContextLoader</code> <i>after</i> bean definitions have been
+	 * loaded into the context but before the context is refreshed.
 	 * <p>The default implementation is empty but can be overridden in subclasses
 	 * to customize the application context.
 	 * @param context the newly created application context
-	 * @see #loadContext(String...)
+	 * @see #loadContext
 	 */
 	protected void customizeContext(GenericApplicationContext context) {
 	}

org.springframework.test/src/main/java/org/springframework/test/context/support/AnnotationConfigContextLoader.java

@@ -21,12 +21,10 @@ import java.util.List;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.springframework.beans.factory.support.DefaultListableBeanFactory;
-import org.springframework.context.ApplicationContext;
+import org.springframework.beans.factory.support.BeanDefinitionReader;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
-import org.springframework.context.annotation.AnnotationConfigUtils;
 import org.springframework.context.support.GenericApplicationContext;
-import org.springframework.util.ObjectUtils;
+import org.springframework.util.Assert;
 
 /**
  * TODO Document AnnotationConfigContextLoader.
@@ -34,99 +32,61 @@ import org.springframework.util.ObjectUtils;
  * @author Sam Brannen
  * @since 3.1
  */
-public class AnnotationConfigContextLoader extends AbstractContextLoader {
+public class AnnotationConfigContextLoader extends AbstractGenericContextLoader {
 
 	private static final Log logger = LogFactory.getLog(AnnotationConfigContextLoader.class);
 
 
 	/**
-	 * TODO Document loadContext().
-	 * 
-	 * @see org.springframework.test.context.ContextLoader#loadContext(java.lang.String[])
+	 * Creates a new {@link AnnotationConfigApplicationContext}.
 	 */
-	public ApplicationContext loadContext(String... locations) throws Exception {
-		if (logger.isDebugEnabled()) {
-			logger.debug("Creating an AnnotationConfigApplicationContext for "
-					+ ObjectUtils.nullSafeToString(locations));
-		}
+	@Override
+	protected GenericApplicationContext createGenericApplicationContext() {
+		return new AnnotationConfigApplicationContext();
+	}
+
+	/**
+	 * TODO Document overridden loadBeanDefinitions().
+	 */
+	@Override
+	protected void loadBeanDefinitions(GenericApplicationContext context, String... locations) {
 
-		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
-		prepareContext(context);
-		customizeBeanFactory(context.getDefaultListableBeanFactory());
+		Assert.isInstanceOf(AnnotationConfigApplicationContext.class, context,
+			"context must be an instance of AnnotationConfigApplicationContext");
+
+		AnnotationConfigApplicationContext annotationConfigApplicationContext = (AnnotationConfigApplicationContext) context;
 
 		List<Class<?>> configClasses = new ArrayList<Class<?>>();
 		for (String location : locations) {
-			final Class<?> clazz = getClass().getClassLoader().loadClass(location);
-			configClasses.add(clazz);
+			try {
+				Class<?> clazz = getClass().getClassLoader().loadClass(location);
+				configClasses.add(clazz);
+			}
+			catch (ClassNotFoundException e) {
+				throw new IllegalArgumentException(String.format(
+					"The supplied resource location [%s] does not represent a class.", location), e);
+			}
 		}
 
 		if (logger.isDebugEnabled()) {
-			logger.debug("Loading AnnotationConfigApplicationContext from config classes: " + configClasses);
+			logger.debug("Registering configuration classes: " + configClasses);
 		}
 
 		for (Class<?> configClass : configClasses) {
-			context.register(configClass);
+			annotationConfigApplicationContext.register(configClass);
 		}
-
-		AnnotationConfigUtils.registerAnnotationConfigProcessors(context);
-		customizeContext(context);
-		context.refresh();
-		context.registerShutdownHook();
-
-		return context;
-	}
-
-	/**
-	 * Prepare the {@link GenericApplicationContext} created by this
-	 * ContextLoader. Called <i>before</> bean definitions are read.
-	 * <p>
-	 * The default implementation is empty. Can be overridden in subclasses to
-	 * customize GenericApplicationContext's standard settings.
-	 * 
-	 * @param context the context for which the BeanDefinitionReader should be
-	 * created
-	 * @see #loadContext
-	 * @see org.springframework.context.support.GenericApplicationContext#setResourceLoader
-	 * @see org.springframework.context.support.GenericApplicationContext#setId
-	 */
-	protected void prepareContext(GenericApplicationContext context) {
 	}
 
 	/**
-	 * Customize the internal bean factory of the ApplicationContext created by
-	 * this ContextLoader.
-	 * <p>
-	 * The default implementation is empty but can be overridden in subclasses
-	 * to customize DefaultListableBeanFactory's standard settings.
-	 * 
-	 * @param beanFactory the bean factory created by this ContextLoader
-	 * @see #loadContext
-	 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory#setAllowBeanDefinitionOverriding(boolean)
-	 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory#setAllowEagerClassLoading(boolean)
-	 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory#setAllowCircularReferences(boolean)
-	 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory#setAllowRawInjectionDespiteWrapping(boolean)
+	 * Returns <code>null</code>; intended as a <em>no-op</em> operation.
 	 */
-	protected void customizeBeanFactory(DefaultListableBeanFactory beanFactory) {
-	}
-
-	/**
-	 * Customize the {@link GenericApplicationContext} created by this
-	 * ContextLoader <i>after</i> bean definitions have been loaded into the
-	 * context but before the context is refreshed.
-	 * <p>
-	 * The default implementation is empty but can be overridden in subclasses
-	 * to customize the application context.
-	 * 
-	 * @param context the newly created application context
-	 * @see #loadContext(String...)
-	 */
-	protected void customizeContext(GenericApplicationContext context) {
+	@Override
+	protected BeanDefinitionReader createBeanDefinitionReader(GenericApplicationContext context) {
+		return null;
 	}
 
 	/**
 	 * TODO Document overridden generateDefaultLocations().
-	 * 
-	 * @see org.springframework.test.context.support.AbstractContextLoader#generateDefaultLocations(java.lang.Class)
 	 */
 	@Override
 	protected String[] generateDefaultLocations(Class<?> clazz) {
@@ -135,21 +95,15 @@ public class AnnotationConfigContextLoader extends AbstractContextLoader {
 	}
 
 	/**
-	 * TODO Document modifyLocations().
-	 * 
-	 * @see org.springframework.test.context.support.AbstractContextLoader#modifyLocations(java.lang.Class,
-	 * java.lang.String[])
+	 * Returns the supplied <code>locations</code> unmodified.
 	 */
 	@Override
 	protected String[] modifyLocations(Class<?> clazz, String... locations) {
-		// TODO Implement modifyLocations() (?).
 		return locations;
 	}
 
 	/**
-	 * TODO Document getResourceSuffix().
-	 * 
-	 * @see org.springframework.test.context.support.AbstractContextLoader#getResourceSuffix()
+	 * Returns &quot;Config</code>&quot;.
 	 */
 	@Override
 	protected String getResourceSuffix() {

org.springframework.test/src/test/java/org/springframework/test/context/junit4/SpringJUnit4SuiteTests.java

@@ -44,10 +44,11 @@ import org.springframework.test.context.junit4.orm.HibernateSessionFlushingTests
  */
 @RunWith(Suite.class)
 // Note: the following 'multi-line' layout is for enhanced code readability.
-@SuiteClasses( {//
+@SuiteClasses({//
 StandardJUnit4FeaturesTests.class,//
 	StandardJUnit4FeaturesSpringRunnerTests.class,//
 	SpringJUnit47ClassRunnerRuleTests.class,//
+	AnnotationConfigSpringJUnit4ClassRunnerAppCtxTests.class,//
 	ExpectedExceptionSpringRunnerTests.class,//
 	TimedSpringRunnerTests.class,//
 	RepeatedSpringRunnerTests.class,//